cal
the height of a rectangular box is 10 in. Its length increases at the rate of 2 in/sec.;its width decreases at the rate of 4 in/sec. When the length is 8 in and the width is 6 in, the volume of the box is changing in cubic inches per second at the rate of ? A 200 B 80 C -80 D...November 30, 2016

cal
Monthly sales, in thousands, of a new laptop computer grow according to the model N(t)=4.7te^-0.3t where t is the number after introduction. Determine the point of diminishing returns and interpret your answer.November 30, 2016

calculus
Union membership as a percentage of the labor force can be modeled by M(x) = 0.0003x3 − 0.066x2 + 4.64x − 81, where x is the number of years after 1900,and M is membership as a percentage of the labor force. a. Find the rate at which membership is changing in 1960...October 21, 2016

research
True or False Research may be used as a diagnostic tool to provide information about what is happening in the enviroment? TrueJune 21, 2012

Research
True or False Researchers who have strong opinions about the subject of a study are likely to do a better job of conducting the research. False, strong opinions could lead to bias results.June 21, 2012

Chemistry
How many mL of a stock solution of 2M potassium nitrate would you need to prepare 100mL of .150 M potassium nitrate?May 16, 2012

math
Dylan loved pencils. He had a whole box full of pencils in different colors and designs. One-seveth of them were yellow, one-sixth of them were blue, and the rest of the pencils had designs on them. What fraction represents the pencils with designs on them?February 1, 2012

chemistry
How many grams of carbon tetrachloride can be produced from reacting 709.0 grams of chlorine with excess methane?December 6, 2011

Chemistry
How do I calculate the wavelength of the emission line when electrons drop from the 4th to the 3rd energy level in the hydrogen atom?February 9, 2011

Algebra
I'm homeschooled so I have no teacher that can help me.I need all the help I can get!Thanks for the help!:) any other suggestions anyone?March 12, 2008

Algebra
Hey! I like math,but this year I'm doing algebra 1 and am not doing so well. I understand the lessons,but then the next day I learn a new way to solve a different problem and confuse the old way with this new way. So on tests,I know how to answer some problems but then get...March 12, 2008